Very numerous: all areas: especially Cork, Derry-Donegal, Connacht etc. The Irish is Ó h-Éigeartaigh (unjust). A sept of Cineál Eoghain in Derry. There was another group, a branch of the Eoghanacht who were the ruling group in Munster, in Cork. IF & SGG.

Heggarty:

Quite numerous: Antrim. See Haggarty and Hegarty.

O'Hegarty:

rare: Dublin etc. Ir. Ó h-Éigeartaigh (unjust). A sept of Cinéal Eoghain in Derry-Donegal, some of whom moved to Cork; the name usually appears as Hegarty, q.v. and sometimes as Haggerty in America. IF.